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As of 20:21 CDT

Weather in Harper, IL

70°Current weather

Harper, Saturday, 8 August, 20:21

Clear. Feels like 67°. High 82°, low 66°.

Pressure30.00 inHg
Wind0.7 mph SE
Humidity1%
Visibility6.2 mi
Dew point24°
Sun, 0986° / 62°0.07Light rain
86 °Light rain

Harper, Sunday, 9 August

Light rain. High 86°, low 62°.

Pressure29.91 inHg
Wind4.9 mph S
Humidity85%
Visibility6.2 mi
Dew point74°
Mon, 1085° / 70°0.49Heavy rain
85 °Heavy rain

Harper, Monday, 10 August

Heavy rain. High 85°, low 70°.

Pressure29.88 inHg
Wind5 mph SE
Humidity78%
Visibility6.2 mi
Dew point74°
Tue, 1185° / 70°0.1Rain
85 °Rain

Harper, Tuesday, 11 August

Rain. High 85°, low 70°.

Pressure29.77 inHg
Wind4.8 mph W
Humidity84%
Visibility6.2 mi
Dew point73°
Wed, 1280° / 67°0Light rain
80 °Light rain

Harper, Wednesday, 12 August

Light rain. High 80°, low 67°.

Pressure29.88 inHg
Wind5.3 mph NW
Humidity89%
Visibility6.2 mi
Dew point71°
Thu, 1372° / 58°0Overcast
72 °Overcast

Harper, Thursday, 13 August

Overcast. High 72°, low 58°.

Pressure30.03 inHg
Wind9 mph E
Humidity76%
Visibility—
Dew point62°
Fri, 1476° / 57°0Partly cloudy
76 °Partly cloudy

Harper, Friday, 14 August

Partly cloudy. High 76°, low 57°.

Pressure30.12 inHg
Wind5.2 mph SE
Humidity59%
Visibility—
Dew point57°
Sat, 1567° / 59°0.03Light rain
67 °Light rain

Harper, Saturday, 15 August

Light rain. High 67°, low 59°.

Pressure30.30 inHg
Wind9.4 mph S
Humidity67%
Visibility—
Dew point55°
Sun, 1671° / 57°0Overcast
71 °Overcast

Harper, Sunday, 16 August

Overcast. High 71°, low 57°.

Pressure30.15 inHg
Wind6.2 mph SE
Humidity70%
Visibility—
Dew point57°
Mon, 1779° / 62°0Overcast
79 °Overcast

Harper, Monday, 17 August

Overcast. High 79°, low 62°.

Pressure30.06 inHg
Wind6.5 mph S
Humidity71%
Visibility—
Dew point64°
Tue, 1883° / 65°0Overcast
83 °Overcast

Harper, Tuesday, 18 August

Overcast. High 83°, low 65°.

Pressure29.94 inHg
Wind13.2 mph SW
Humidity69%
Visibility—
Dew point67°
Wed, 1972° / 59°0.07Light rain
72 °Light rain

Harper, Wednesday, 19 August

Light rain. High 72°, low 59°.

Pressure29.97 inHg
Wind15.6 mph NW
Humidity86%
Visibility—
Dew point58°
Thu, 2062° / 51°0Overcast
62 °Overcast

Harper, Thursday, 20 August

Overcast. High 62°, low 51°.

Pressure30.12 inHg
Wind8.5 mph N
Humidity72%
Visibility—
Dew point51°
Fri, 2173° / 52°0Partly cloudy
73 °Partly cloudy

Harper, Friday, 21 August

Partly cloudy. High 73°, low 52°.

Pressure30.06 inHg
Wind6.3 mph SE
Humidity62%
Visibility—
Dew point56°
Sat, 2272° / 54°0.03Light rain
72 °Light rain

Harper, Saturday, 22 August

Light rain. High 72°, low 54°.

Pressure29.85 inHg
Wind10.4 mph SE
Humidity78%
Visibility—
Dew point58°
Sun, 2378° / 63°0Clear
78 °Clear

Harper, Sunday, 23 August

Clear. High 78°, low 63°.

Pressure29.91 inHg
Wind14 mph SW
Humidity50%
Visibility—
Dew point56°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Harper, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Harper, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.